Pulley.



PATENTED APR. so, 1907.

. J. A. KAPLAN.

PULLEY. APPLIOATION FILED JAN. 25, 1906.

R O T N E V m map] &

. JOSEPH A. KAPLAN,

UNITED STATES PATENT OFFICE-.-

OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO JOSHUA RHODES, OF ALLEGHENY, ANDWVILLIAM H. LATS'HAlV, OF PITTSBURG',

PENNSYLVANIA.

PULLEY.

Specification of Letters Patent.

Patented April 30, 1907.

T otZZ whom it may cancer-n.-

Be it known that I, J OSEPH A. KAPLAN, a resident of Pittsburg, in thecounty of Alle gheny and State of Pennsylvania, have invented a new anduseful Improvement in Pulleys; and I do hereby declare the following tobe a full, clear, and exact description thereof.

This invention relates to ulleys and more especially to sectionalpulleys constructed entirely of wrought metal.

The object of the invention is to provide a pulley which is very light,strong and true and which can be quickly and cheaply manufactured.

The invention consists in details of construction hereinafter describedand claimed.

In the accompanying drawings Figure 1 ism part a side view and in art isa sectional view of a pulley constructor according to my invention; Fig.2 is a sectional view thereof on the line 22, Fig. 1; Fig. 3 is anenlarged detail sectional view showing the manner of connecting thespokes to the rim and hub; Fig. 4 is a perspective view of a hubsection; Fig. 5 is a sectional view of the hub; Fig. 6 is a side view ofa spoke, showing the same on an enlarged scale; and Figs. 7 and 8 are detailed views partly in section showing modifications of the hubsections.

The pulley illustrated is constructed in two similar sections, althoughif desired the principle may be applied to a pulley having three or evenfour sections. The rim consists of two similar sections 1 of plate metalbent into semi-circular form and provided with spoke holes 2counter-sunk on the outer face as shown at 3 and having riveted to theirends angle brackets or ears 5 which project inwardly as shown and whichare provided with holes for receiving bolts 6 or other suitableconnecting means.

The hub sections 7 are formed by forging metal practically tosemi-tubular shape with edge portions 8 projecting outwardly so as toform radial ears which are provided with holes or the like for receivingbolts '9 or other siutable connecting means. These hub sections areprovided with spoke holes 10 counter-sunk on the inner face as at 11 forreceiving the inner ends of the spokes.

The spokes are formed of suitable metal bars or rods provided withshoulders 12 at their ends for seating against the inner face I of therim and outer face of the hub, and

with projecting tenons 13 which are inserted in the spoke holes in therim and hub and upset tl'ierein. The upsetting of the inner ends of thespokes forms a slight head 14 projecting into the bore of the hub sothat if placed directly on a shaft the pulley would bear only on theseprojecting portions and consequently would wabble on the shaft. Toprevent this I provide the hub on its innor face with a circulardepression or groove 15 which is of sullicient depth so that the heads14 will not project beyond the same. Consequently the pulley has abearing on the shaft or bushing only at the end portions and cannotwabblc. The groove 15 has the further advantage that should the shaftitself have any inequalities the pulley will never theless bear on theshaft only at the end portions 16.

The shoulders and tenons are formed on the spokes, preferably by turningdown the ends thereof in a suitable lathe. The shoulders 12 must beformed very accurately as the trucness or concentricity of the pulleydepends upon the accuracy of the distance between the shoulders 12 atthe two ends of the spokes. These shoulders 12 also give a strongbearing against the rim and hub so that the pulley is enabled towithstand veryheavy pressures. In order that the strength may be maximumthe outer face of the hub will be flattened around the spoke holes, suchas turning down seats 17 which are [lat and therefore form a bearing forthe shoulders on the inner ends of the spokes. These seats are turneddown so all of them are the same distance from the axis of the hub, thisalso aiding in producing a thoroughly concentric pulley.

In turning down the end of the spoke to form the tenon to enter the hubthe formation of a sharp angle between the shoulder 12 and tenon 13 islikely to leave a scratch or nick in the angle and as a consequencethere is liability of the tenon shearing oil under severe strain. Toprevent this the ends of the spokes are so shaped that theshoulder 12 isjoined to the tenon 13 by means of a fillet or curved portion 18 whichentirely overcomes the tendency to shear off due to a sharp angle or aslight cutting into the metal at that point, and increases the strengthof the tenon many times in proportion to the added metal of the filletitself. The spoke holes in the hub are reamed out, as shown at 19, so asto conform in shape to this fillet.

' When the pulley is provided with a sufficient number of spokes to givegreat strength some of the spokes come so near to the ears 8 on the hubsections that there is not room for the shoulders 12. To provide forthis the hub sections have suitable depressions or clearances to makeroom for the shoulders on the spokes. These may be formed by suitableprojections on the forging dieswhich press depressions 20 into the outerface of the hub section at the base of the ears 8. The same result maybe obtained by cutting away the metal of the hub at this point either toform a hole, as shown at 21, Fig. 7, or by forming an opening out to theend of the ears 8 as shown at 22, Fig. 8. The latter method, however, isnot desirable as it unnecessarily weakens the hub sections. The hubsections are also of suffi cient thickness to have tapped therethrough aset screw 25 for clamping the same directly on the shaft if desired.These hub sections furthermore are adapted for receiving the ordinarybushings 26 so that a pulley may be applied to various sizes of shafts.These bushings may have a keyway 27, and the screw 25 may be located toproject into said kcyway, as shown.

The two pulley sections are identical in construction and are united bymeans of the bolts 6 and 9 so that the pulley can be readily placed uponor removed from the shaft without disturbing the hangers or couplings.The entire pulley is made from wrought metal, the hub sections beingforgings, the rim sections being rolled plates bent to shape, the spokesbeing rolled bars, and the ears or brackets 5 being formed of suitablepunched and bent up pieces of wrought metal. The pulley possesses themaximum amount of strength for weight thereon. All the parts thereof canbe quickly and cheaply made and with such accuracy that the finishedpulley is practically mathematically concentric. The formation of thespokes in the manner described with shoulders and tenons secures greataccuracy in concentricity. The joining of the shoulders 12 to tenons 13by means of a fillet or curved portion overcomes any weakness at thispoint which might result from the formation of a sharp angle. Theprovision of a groove on the inner face of the hub sections does awaywith the necessity of finishing the inner upset ends of the spokes otherthan is done by the riveting hammer. At the same time it gives a bearingfor the hub at its end portions only, so that the pulley will not wabbleon the shaft even though the upset inner ends of the spokes should be ofconsiderable height, or the shaft itself should be irregular in shape.

What I claim is:

1. A metal wheel provided with a hub, rim, and connected spokes, saidhub having spoke-receiving openings provided with fiaring outer ends,said spokes having reduced end portions fitting in said openings andriveted therein, and having shoulders resting on the outer face of thehub and curved portions connecting said shoulders and reduced endportions and contained in the flaring outer ends of the openings in thehub.

2. A metal wheel provided with a hub, rim, and connecting spokes, saidhub having spoke-receiving openings provided with flaring outer ends andwith seats surrounding the same, said spokes having reduced end portionsfitting in said openings and riveted therein, and having shouldersresting against the seats on the hub with curved portions connectingsaid shoulders and reduced end portions and contained in the flaringouter ends of the openings in the hub.

3. A sectional metal wheel comprising a partible hub and rim, and spokesconnecting the same, said partible hub having spokes holes provided withflaring outer ends and being provided with a circular groove in itsinner face with which the spoke holes communicate, said spokes havingshoulders resting against the outer face of the hub and having reducedend portions projecting through the spoke holes and upset on the innerface of the hub with the upset ends lying in said circular groove, theshoulders on the spokes being joined to the end. portions by means offillets or curved portions.

In testimony whereof, I the said JOSEPH A. KAPLAN have hereunto set myhand.

JOSEPH A. KAPLAN.

W itnesses ROBERT C. TOTTEN, G. O. RAYMOND.

